Grinding machine



7 Sheets-Sheet 1 lllll Nl. H. ARMS GRINDING MACHINE Flled Nov 8, 1932GRINDING- MACHINE Filed Nov. 8, 1952 7 Sheets-Sheet 2 s M R A H. M

GRINDING MACHINE Filed Nov. 8, .1932 7 Sheets-Sheet 5 7 Sheets-Sheet 4 sM R A H. M.

GRINDING MACHINE Filed NOV. 8, 1952 M. H. ARMS GRINDING MACHINE FiledNov. 8, 1932 7 SheefSSheet 6 mmm em. 3 l3 M- H ARMS GRINDING MACHINEFiled Nov. 8, 1952 7 Sheets-Sheet 7 to show the working parts within.

tools.

Patented Sept. 3i, 1935 Unire stares altari PATENT OFM@ApplicaticnNoi/'ember 8, 1932, Serial No. 641,733

24 Claims.

This invention relates to a multiple spindle grinding machine or thelike having work-holders mounted in a turret for simultaneouspresentation of a plurality of pieces of work to the several Theembodiment of the invention hereinafter described includes toolcarriages with improved mountings for feeding the tools laterallyagainst the work, improved mechanism for reciprocating the tools to andfrom the work, and a truing device for each tool automatically movinginto and out f operative position as the carriages withdraw the toolsfrom the work or advance them thereto.

Vario-us other novel and advantageous features and combinations will beapparent to one skilled' in the art from the disclosure of the inventionin the embodiment thereof hereinafter described and illustrated on thedrawings, of which,-

Figure l is a side elevation of a grinding machine embodying theinvention.

Figure 2 is a plan View of the same with the lid of the turret removed.

Figure 3 is a iront elevation of the same, a por-- tion being cut awayto show parts in section.

Figure 4 is a section on the line 4`4 of Figure 3.

Figure 5 is a fragmentary section on the line 5-5 of Figure 4l. Y

Figure 6 is a section on the line 6--6 of Figure 3. Y

Figure '7 is a section on the line i--T of Figure 6.

Figure 8 is a section on the line 8-8 of Figure '7.

Figure 9 is a plan View of a modified form of the invention.

Figure l0 is a fragmentary elevation of the same, a portion of thecasing being broken away Figure ll is a wiring diagram for the motorsfor driving the work-holders, illustrated in Figure l0.

The invention may be embodied in a machine including a bed casting 2thaving a number of wings 2i extending laterally therefrom. On the bodyportion of the bed is mounted a turret 22 to rotate on a vertical axis.The turret and wings carry work-holders and tools in such a way thatwhen the turret is in any one of its indexed positions, the tools can bepresented to pieces of work carried by work-holders adjacent to therespective tools, In the embodiment of the invention illustrated on thedrawings, the work-holders are shown as radially arranged on the turret,they tools being mounted on the Wings of the bed in line with certain ofthe work-holders when the turret is in any one of its indexed positions.Four work-holders are shown, these being arranged at right angles toeach other. Three tools are interior working aligned respectively withthree `of the work-holders, the fourth workholder being at a loadingstation in front of the machine. The invention, however, is not 'limitedtoV these particular numbers of Work-holders or tools. For the supportof the work-holders, the turret 22 is provided with a series of radiallyextending arms 23. Within each arm Z3 is fixed a hollow sleeve A shaft3i extends through this sleeve and is mounted therein on suitable ballbearings for rotation on a horizontal axis. Mountedon the outer endportionof the shaft 3l is a suitable chuck 32 which is adapted to hold apiece of work W.

In the embodiment illustrated in the drawings the work is shown as acylindrical collar or bushing to be finished o-n its interior surface.Suitable clamps 33 may be employed to hold the work solidly in positionin the chuck 32. The inner end of the shaft 3i' projects into theinterior of the turret 22. Suitable mechanism is provided for rotatingthe chuck 32. For this purpose a lcommon drive may be employed, or thechucks may be independently driven. As shown in Figures 2 and 3, forexample, the several chucks may be driven by a single motor. For thistype of drive, a miter gear wheel 35 is loosely mounted on the inner`end portion oi each shaft Si. Fixed to a face of the gear wheel 35 is aring 36 having' a conical friction surface il on its rim.` This surfaceis engageable by a complemental friction surface of a clutch member lilwhich is splined to a reduced end portion il of the shaft 3l. The innerend of the shaft is drilled axially to hold a suitable spring @l2 whichnormally pressesthe friction face of the clutch member 4U into drivingengagement with the friction face 3l of the ring 36. Thus the gear Wheel35. is usually connected to the shaft 3i through the clutch member do.The gear wheels 35 of the several shafts 3i are all in mesh with ahorizontal gear wheel ifthis gear being mounted on a Vertical quill' iton which is also mounted' a suitable pulley di. This pulley ispreferably rotated constantly during the operation of the entire`apparatus, a suitable driving means such as' an electric" motor 563being operatively connected with the' pulley il as by one or more belts5f. The quill t6 rotates about a ixed shaft or post 52, this post beinganchored at its lower end in the bed' il. The turret 22 has a downwardlyextending tubular projection 555 which surrounds the` quill t6 and isseparated therefrom by suitable ball bearings so that the quill andturret are both freely rotatable with respect to each other. It isdesirableV that the rotation oi" each chuck shaft 3i' be stopped whenthe arm 23 containing it reaches work-loading position in which the armand shaft extend forwardly of the apparatus. To this end a suitable camlug til" is mounted on the fixed vertical shaft 52'.

When the turret 22 revolves so as to move one of the arms 23 from thelast operating station to the loading station, the clutch member 48corresponding toY this arm 23 moves into engagement with the fixed camlug 60. This causes the clutch member 40 to move radially outwardagainst pressure of its spring 42, disengagng its friction face from thefrictional surface 31 of the ring 36. Thus the constantly turned gearwheel 35 is disconnected from its shaft 3| as long as the correspondingarm 23 remains in the loading position. As soon as this arm is swung byindexing movement of the turret 22 from the loading position to thefirst operating position, the clutch member 48 moves out of engagementwith the cam lug 60 and thereupon connects the corresponding gear wheel35 and shaft 3| for rotation of the latter.

Mechanism for indexing the turret 22 is illustrated in Figures 3 and 6.For this purpose a suitable motor 65 is connected through gears 66 andS7 to a shaft |58. Mounted on this shaft is a pinion 'IIJ which mesheswith a pinion 'II loosely mounted on a shaft II2. Mounted on the shaftl2 is one member 'I3 of a clutch, the other member 'I4 being formed onor rotatable with the pinion 1|. An end portion of the shaft 'I2projects through the hub of the pinion 'II and carries a spring 'i5which tends to hold the clutch member 'i3 in engagement with the clutchmember 14. The opposite end of the shaft 'I2 rests against a suitableend bearing 88 which, as shown, may be carried by a sliding carriage 8|,the latter being slidable in the direction of the axis of the shaft 'I2to permit the clutch member 'F3 to move clear of the clutch member M. Astiff spring 82 is provided to press the shaft 'I2 axially to a positionin which the clutch members 'I3 and 'I4 are engaged so that the shaftmay be driven. Mounted on the shaft I2 for rotation therewith is asuitable worm 83 which meshes with a worm gear 84, the latter beingfixed on a vertical shaft 85. As shown in Figure 3, the shaft 85 carriesa pinion SEI fixed at the upper end thereof, this pinion meshing with aring gear 9| secured to the turret 22. Thus rotation of the gear wheelS4 results in indexing movement of the turret 22. Stops for limiting theindexing movement of the turret are provided in the form of stop pins95, one of these pins being mounted on the under side of each of thearms 23, as shown in Figures 2 and 3. A stop rod S8 is verticallyslidable in the bed 2|) and is arranged so that its upper end portion isnormally in the path of movement of the stop pin 95 when the turret isrotated on its axis. Indexing movement of the turret, as illustrated inFigure 2, is in a counterclockwise direction, hence the gear wheel 84 isdriven in a clockwise direction by rotation of the worm 83. Indexingmovement of the turret brings one of the stop pins 85 into engagementwith the upper end of the stop rod 95 which is in its path of motion.This prevents further rotation of the turret or of the gear wheel 84.The worm 83, however, continues to rotate with the shaft 'I2 and iscompelled to travel axially, or tangent to the stationary gear wheel 8d.As a result the shaft I2 is also moved axially until the clutch element'I3 is moved out of engagement with the clutch element l'fi, this axialmovement of the shaft being against the pressure of the springs 82 and15. Thus the shaft 12 disconnects itself from the pinion "II, the spring82 thereupon acting to hold the turret firmly in its indexed positionwith one of the stop pins 95 against the upper end portion of the stoprod 96.

Means for moving the stop rod 9E into and out of operative position areillustrated in Figures 3 and 6. A spring is provided to react against acollar IEiI mounted on the stop rod, in a direction to press the roddownwardly out of operative position. Fixed to the rod Q6 is a secondcollar |52, the under face of which is engaged by a pair of arms |55mounted on a cross shaft ISS which is rockably mounted in suitablebearings |01 and carries a crank arm IIS. A thrust rod |I| bears at oneend against the crank arm II, the opposite end of the thrust rod IIiriding on the edge of a cam I I2. This cam has a recess I|3. The camdisk I|2 may be mounted on a shaft H4 with a gear wheel H5 which isdriven by a worm IIS mounted on the shaft E58. When the end of the rodII I rides into the recess I i3 of the cam I i2, the rod is moved towardthe left by the spring |80 acting through the shaft |08 and the crankarm IIB, releasing the stop rod 96. When the end of the rod III ridesout of the recess III-3, the rod is pushed toward the right, raising thestop rod 96 into operative position against the pressure of the spring IMi. When the turret is stationary, one of the stop pins Q is stronglypressed against the stop rod 96 by the spring 82, so that the rod 98 maybe frictionally held in locking position even when released from below.It is desirable to relieve this pressure to permit the stop rod to moveclear of the pin with which it is engaged. To this end a vertical shaft|20 is provided with an eccentric member I2I bearing against an end ofthe worm 83. If the shaft |28 is rocked in a counterclockwise direction,the eccentric member I2I will press against the worm 83 .and this willresult in an axial movement of the shaft "i2 toward the end bearing 88.Such axial movement of the shaft will result in a counterclockwisemovement of the gear wheel 84 and hence in a clockwise` movement of theturret 22 sufficient to relieve the pressure between the stop rod 95 andthe stop pin 95 in contact therewith. Rocking movement of the shaft |28may be obtained by means of a lever arm |22 mounted thereon. A pin |23is mounted near the end of this arm and is engageable by a pin |24mounted on the cam member I I2. The position of the pin |24 is sorelated to the recess |I3 that the pin |22 comes into engagement withthe pin |23 so as to rock the arm |22 and relieve the pressure of thestop rod 96 against a pin 95 just after the rod Iii rides into therecess II3 of the cam member H2 to release the rod S5. Thus when the pinE25 clears the pin |23, releasing the arm 222 and hence the shaft "i2,the latter moves axially under the inuence of the spring 82 so as toconnect the clutch members 'I3 and 'lll for the resumption of rotationof the shaft i2. This causes indexing movement of the turret until thenext succeeding pin 95 is stopped by engagement with the upper end ofthe stop rod Q5 which has meanwhile been raised as the rod I I I ridesout of the recess II3. This brings into alignment with the tools threeof the arms 23 which carry the several pieces of work, the fourth arm 23being at the loading station.

For the grinding away of portions of the work, the tools must besuitably fed against the surfaces to be ground. According to the presentinvention, such feeding movement is obtained by relative movementbetween the work and the tool in a substantially vertical direction,that is,

cof

surface of the wo-rk to be ground.

` mounted on a shaft |43.

in the general direction of the axis of rotation of' the turret. Thisrelative feeding movement can be obtained in various ways such as thatillustrated on thedrawings. As shown, on eachof the wings 2| of the' bed20 is mounted a substantial bracket |25 which projects upwardly andoutwardly from the top of the wing. A fixed horizontal shaft |26 ismounted at its mid-portion on said bracket. A tool carriage |21 isrockably and slidably mounted on said shaft, the end portions of theshaft bearing in the carriage at one side thereof. The carriage projectsfrom the shaft across and above the top of the wing 2|, the side of thecarriage remote from the shaft |26 being supported by a roller |28.Mounted on` the carriage |21 approximately above the shaft |26 is amotor |30 connected by any suitable means such as a belt |3| to a shaft|32 which is journalled horizontally in the carriage 2o l |21 to pointtoward the axis of rotation of the turret 22.

lative position with relation to a piece of work W, and also back andforth across the face of the work, when the carriage |21 slides alongthe shaft |26. The tool shaft parallel to the carriage rock shaft |26,the axes of these shafts being substantially spaced apart andapproximately in the same horizontal plane.

A lateral relative feeding motion between the tool and the work isrequired when the tool is in operative position to press the toolagainst the In the illustrated embodiment of the invention, this feedingmotion is effected by a slight rocking movement of the carriage |21about the shaft |26.` Since the tool axis is horizontally spaced fromthe .rocking axis of the carriage, the feeding movement of the tool isupward or downward, that is, in the general direction of the axis ofrotation of the turret. This results in a direction of tool feed whichis approximately perpendicular r; to the movement of the work when Ytheturret is l be mounted in the upper end portion of a vertical slidemember |40, the lower end being in threaded engagement with theinternally threaded hu-b of a bevel gear wheel IM. `This' gear wheelmeshes with another wheel Orr this shaft is also mounted a handwheel |46which may be manipulated to rock the carriage |21. For automatic controlof the tool feed, a collar |50 may be frictionally mounted on the shaft|43 to rock therewith, the collar |50 having an arm |5|` extendingtherefrom and provided at its outer end with a cam follower |52 adaptedto ride on the edge of a cam |53. This cam is preferably of' a spiralshapeV so that as the cam is revolved about the axis. o-f a shaft v|55on` which it is mounted.. the cam follower |52 is swung away from. theaxis of the shaft |55, thus rocking the collar |50 and shaft |43. Thisin turn rocks the carriage |21 and moves the tool |35 against thesurface of the work if the tool is' in operative position relative tothe work. This tool feeding mechanism includes meansl for adjusting `thefeed automatically to compensate for where surface portions of the toolare removed when An idle pulley |33` may be employed to keep the beltclear of portions of the carriage bed by a tapered spring-pressedbearing |621 The truing point is so mounted as to swing in a circletangent to the periphery of the tool |35 at itsuppermost point, thisbeing the point at `which the tool engages the work. This requires that.the axis. about which the truing point swings is in the vertical planecontaining the axis of rotation of the` tool. Thus the pivot |62 must be either directly above or directly below the axis of the tool |35. Gnthe `drawings it is shown as directly below.. The arm |6| may besuitably shaped to clear the-tool when" the truing point is in operativeposition. |63 may be provided for each arm |6| and connected thereto .asby a link |64, the solenoid being adapted to be energized to swing thearm. |61 and point. |60 into position for. trolng the tool |35. Thisoperative position of the point may be definitely established by a limitstop device such as an arm |65 rockable with the arm |6| to engage afixed member such as the bed, or a wear-piece mountedthereon, when thepoint |50 is in correct operative position. A spring |66 may be arrangedto pull the arm |6| to inoperative position when the solenoid is.deenergized. The solenoids |63 for the several arms |6| may besimultaneously controlled by a single switch or, as shown, each solenoidmay be connected with a separate control switch |61. Each switch isprovidedV with an operating arm |68 adapted to be engaged by a. camelement |69 on the carriage |21 to open the switch |61 when the carriageadvances toward the workso that duringthe grinding operation, thesolenoid is deenergized and the spring |66 holds the arm |6| and point|60. out of the way.

For the traversing movements of the tools across the surface of the workhydraulic apparatus may be provided as illustrated particularly inFigures 3 and 4. As shown in Figure 3,a collar |10 is loosely tted onthe tubular extension .53 of the turret 22. Projecting radially fromthis collar |10` are four arms |1|. Three of these arms are connected tolinks |12 for the reciprocation of the carriages |21, the fourth arm |13being connected through a piston rod |15 to a power piston reciprocableby a suitable fluid .such as oil under pressure in a cylinder |80. Eacharm |12 ispivotally connected at its outer end to an intermediate pointof an upright lever |86. Each lever |86 is rockably mounted at its lowerend |81 on the bed so that reoiprocation of the arm |12 Vattached to thelever |86 swings the upper end of the lever toward and away from theturret. At. the upper end of each lever |86 may be mounted av roller |89riding in a groove or equivalent recess in the carriage |21. Rocking ofthe lever|86 on its pivot |81 thus causesV the carriage |521 to slide onthe shaft |26 to move the tool |35 into and out of operative position..

Mechanism for operating, and controllingthe piston inthe cylinder |80;is fully illustrated and described in the application. of Bryant SerialNo. 640,846, filed November 2,. 19.32. ISuch mechanism includes valvemeans. in a valve chest |90-,

and an oil reservoir |=6t containing a pump |02.'

which may be. con-nected to the shaft 68. as: by a pulleyand-beltconnection. litt.. The. Valve means. in the chest |90 is directlycontrolled by a valve.

the4 tool is dressed or trued by a suitable truingl A solenoid f stem206 which projects therefrom and is 'axially' movable by an arm 250carried by the piston rod |15 to reverse the direction of motion of thepiston. The piston may move through a short stroke to reciprocate thetool on the surface of the work, or through a long stroke to retract thetool from the work for indexing the turret and truing the tool. Thestroke of the piston is controlled by a solenoid 250 which, whenenergized, limits the stroke of the piston to traversing the tools overthe work. When the solenoid 260`is deenergized, the piston is permitteda longer stroke to retract the tools from the work, as described in thesaid application of Bryant. For the automatic control of the solenoid asuitable cam disk 235 may be provided, as shown in Figures '7 and 8. Aswitch 266 having an operating arm 261 is mounted adjacent to the camdisk 265 so that a cam follow 268, carried by the arm 261, is inengagement with the edge of the disk 265. This edge has a portion oisetinwardly as at 210. When the cam follower 268 reaches the off-setportion 2l@ of the cam edge, the arm 261 rocks opening the switch 256and deenergizing the solenoid 260 to permit withdrawal of the tools fromthe Work.

The motor 65, in addition to driving the indexing shaft 86 and theindexing cam H2, may also be employed to drive the solenoid control cam265 and the feed cam |53. To this end the shaft 68 may be provided witha worm 305 meshing with the gear wheel 39| mounted on the shaft 302.This shaft may be mounted in bearings near the ends of opposite wings 2|of the bed frame.

-The shaft 302 is operatively connected as by bevelled gears 305 and 306in each of these wings to shafts 301. In the wing 2| of the bed frameinto which the shaft 58 extendsa cross shaft 3| may be driven through aworm 3|2 on the shaft E8 and a gear wheel 3l3 on the shaft 3|| meshingtherewith. Each of the shafts 301 and 3H is operatively connected with acorresponding shaft |55 as by a suitable train of gear wheels 3|5, 3|6,and 3|"|. Each shaft |55 carries a corresponding feed cam |53, ashereinbefore described. On one of the shafts |55 may be mounted thesolenoid control cam 265. As a result of this arrangement, the motor 65is employed for the simultaneous driving of these various cams.

In order to synchronize the movements of the various cams with theindexing of the turret, the worm 83 is preferably of such a kind as todrive the gear wheel 84 and shaft B5 at about six times the speed ofrotation of the indexing cam |2, the solenoid control cam 265, or thefeed cam |53. As a result, the indexing movement of the turret to shiftthe chucks from one operating station to the next takes place during aperiod equivalent to about one sixth of a revolution of the other cams.This speed ratio may, of course, be altered as desired by selection ofsuitable gearing for the drive of the several cams.

For` some purposes it may be desirable to drive the work-holders atdifferent speeds for the successive grinding operations. For example, itmight be advantageous in some cases to rotate the work-holder at acomparatively slow rate during the rough grinding operation by #l tool,and more rapid rates of rotation of the work during the finishingoperations of #2 and #3 too-ls. Such Various speeds at the severaloperating stations may be obtained in various ways such as by the use ofseparate driving motors for the several work-holders, as shown inFigures 9-11. As therein shown, a gear wheel 330 may be mounted on'theinner end portion of each" shaft 3|. Each gear wheel 330 meshes with aworm 33| on a shaft 332 driven directly by a motor 335. There is thus aseparate motor 335 for each work-holder, these motors being suitablymounted within the turret 22. The speed of the motors is individuallycontrolled according to the station of the Work-holder, any suitablemeans being employed for this purpose. As shown, the turret 22 isadapted to revolve about a central stationary shaft 335, preferablyhollow, on which is mounted a commutator member 331 of insulation. Setsof contact elements 340 are carried by the member 337| in positions forcontact with sets of brushes 34|, carried by the motors 335, whentheccrresponding work-holders are in positions for operative relationwith the tools |35. Thus, in the embodiment illustrated, there are threesets of contact elements 340 for the three work-holders adjacent to thetools, the brushes of the fourth motor having no circuit connections atsuch time so that the motor is idle and the work in the work-holder canbe readily changed. Wires 352 'nay extend from the several contactelements 3115 through the hollow shaft 336 to respective control boxes355 conveniently located on or near the machine. The setting of thesecontrol boxes determines the speed of rotation of each work-holder whenit moves into position for a grinding operation.

In the operation of the apparatus as a whole, the turret is indexedwhile the tools are retracted from their operative position and arebeing moved slowly past their respective truing tools. The indexingmovement of the turret is stopped when one of the stop pins 85 engagesthe upper end of the stop rod 96. As hereinbefore described, this causesthe worm 83 to act as a nut on the gear wheel 84 so as to move the shaft'i2 axially to disconnect the clutch member I3 from the clutch member 'Mas indicated in Figure 6. The spring 82, presented against the end ofthe shaft 12 through the bearing 80, holds the turret firmly in itsindexed position. The hydraulic mechanism is so regulated by previousadjustment that the piston moves the tools |35 into the correspondingpieces of work shortly after the turret has reached its indexedposition. When the piston rod reaches its extreme tool-advancingposition the solenoid 260 is energized to limit the stroke of the toolsto a movement back and forth within the work. At the same time theconstant revolution of the shafts |55 brings the feed cams |53 intoengagement with the cam followers |52, resulting in a lateral feedingmovement of the tools against the surface of the work which is to beground. During the grinding operation, the index cam |2 is constantlyrotated, the deenergizing of the solenoid 265 being timed to permit theretraction of the tools from the work before the recess H3 in the indexcam |62 reaches the end of the rod Thus, the tools are all clear of thework when the rod is permitted to move into the recess I3, releasing thestop rod 95. Immediately after this, the squared pin |24 on the cam disk||2 engages a pin |23 in the end of the arm |22 and rocks the arm |22sufliciently to relieve the pressure of the spring 82, acting through astop pin on the stop rod 96. Thus the retraction of the stop rod 96under the influence of gravity and the spring |55 is permitted so thatthe turret is then free to be revolved. The pin |23 thereupon ridesclear of the pin |24, permitting the arm |22 to swing back and the shaft12 to move axiallyy so as to reengage the clutch memitt bers It', 141The` shaft` 12 is thereupondriventhrough the gear wheels 'it and 1 I,this resulting in indexing movement of the turret to the next position.Since the time-required for the grinding step is considerable, ampletime is available during the grinding step for an operator to remove thefinished' piece of work in the chuck at invention as defined in thefollowing claims.

I :claim: I. In a machine of the class described having a bed, aturretrotatable on said bed about a vertical axis, and a plurality of radiallyprojecting work-holders on said turret, a plurality of tool carriagesmounted on said bed, each said tool carriage being roclrable on ahorizontal axis, means associated with each tool for rotating the toolon an axis parallel to the rocking axis of the car- ?-1 riage, means foradvancing each tool along its own axis toward the turret, and means forautomatically rocking each carriage while the tool is inposition forengagement with the work to impart lateral feeding movement toy eachsaid tool.`

`2. In a turret grinding machine, a flat turret, a werk-holder carriedby said turret and arranged transversely with respect to the turretaxis, a tool rotatable on an axis aligned with said holder, drivingmeans for said tool, a carriage supporting said tocl and" drivingmeans,` means rockably supporting said carriage, means for rocking saidcarriage on an axis transverse to the turret axis, whereby lateralfeeding movement is imparted to said tool, and means for reciprocatingsaid carriage and tool toward and from said turret.

3; A machine of the class described comprising a rotatable turret, aplurality of work-holders carried by .said turret and rotatable on axestransverse tothe turret axis, a tool into operating relation with whichsaid work-holders may be successively positioned by indexing of saidturret, and power means for producing relative feed motion between saidtool and the holderin operating relation therewith in the generalrdirection of the axis or" rotation of said turret.

4. A machine of the class described comprising a rotatable turret, aplurality of Work-holders carried by said turret, a tool into operatingrelation with which said work-holders may be successively positioned byindexing of said turret,

means for traversing said tool ,relatively to the work on which it is`operating in a direction transverse to the turret axis, and power meansfor` producing a predetermined relative feed motion between said tooland Work in the general direction oi the axis of rotation of the turret.

5. A machine of the class described comprising a rotatable turret, atool rotatable on an axis transverse to the axis of rotation of theturret, a plurality of work-holdersmovable successively into operativerelation with said tool by indexing oi `said turret, means fortraversing saidtool in the direction of-its axis, and power driven cammeans for producing a predetermined feeding motion between the tool andwork in the general' direction of the axis of rotation of the turret.

f"6. A machineof the class described comprising a rotatable turret, aplurality of work-holders arranged radially in said turret, atoolrotatable on an axis substantially perpendicular to the axis of rotationot said turret, means for indexing said turret to positions in which thework-holders are brought successively into operative relation with saidtool, means fortraversing said tool in the direction of its axis, meansfor producing a predetermined teeding movement between said tool andwork` in the general direction of the axis of rotation of the turret,and common driving means for the indexing and feeding means. Y

7. A machine of the class described comprising a rotatable turret, arotatable tool, a carriage for said tool rockable on an axis parallel tothe tool axis to impart feeding movement to the tool, the tool rotationaxis and carriage rocking axis being in a plane substantiallyperpendicular to the axis of rotation of the turret, and a plurality ofwork-holderson said turret movable successively into operative relationwith saidtool by indexing ofthe turret.l l,

, 8. A machine ofthe class described comprising a rotatable turret, arotatable ftoola carriage for said tool rcckable on an axis parallel tothe tool axis to impart feeding movement to the tool, the tool rotationaxis and carriage rocking axis being in a plane substantiallyperpendicular to `the axis of rotation of the turret, a

plurality of Work-holders `on said turret movable successively into.operative relation with' said tool by indexing movement of the turret,and means for traversing said tool'in a direction transverse to the axisof rotation of the turret.

9; A `machine of the class described comprising a rotatable turret, aplurality of rotatable tools, a plurality of work-holders carried bysaid turret and movable into operative relation with successive tools by`indexing of said turret, and power driven cam means for simultaneouslyfeeding said tools. transversely of their respective axes of Vrotationand in a direction substantially parallel to the axis of rotation ofsaid turret.

10. A machine of the class described comprising a rotatable turret, aplurality of tools, a plurality `of Work-holders carried by said turretand movable into operative `relation with successive tools by indexingof said turret, means for simultaneouslytraversing said tools`relatively to adjacent work-holders, and power means for automaticallyand simultaneously feeding said tools at independent predetermined ratesin the general direction of the axis of rotation of said turret.

11. A machine of the class described comprisnga turret rotatable about avertical axis, a plurality of work-holders carried by said turretandarranged radially therein, a plurality of tools arranged around saidturret to be simultaneously in operative relation with diierent ones ofsaid work-holders, said tools being rotatable on axes transverseto theturret axis, means for indexing said turret to shift said work-holdersfrom one tool to the next, meansfor simultaneously traversing saidtoolsalong their respective axes, and means forfeeding said tools in thegeneral direction ofthe axis of rotation of the turret.

12. A machine of the class described comprising a bed, a turretrotatable on said bed, workholders carried by said turret, a pluralityof tools arranged for simultaneous operative relation with certain ofsaid work-holders, means for indexing said turret to shift saidwork-holders from tool to tool, a carriage for each said tool rockableon an axis transverse to the axis of the turret to impart feedingmovement to the tool, said carriages being slidable along their rockingaxes to impart traversing movement to the tools toward and from` theaxis of said turret,

and means engaging said carriages at points adjacent to their respectiveWorking axes to irnpart sliding movement to saidcarriagessimultaneously. f Y

` 13. In a machine of the class described, a rotatable grinding tool,means for imparting lateral feeding movement to said tool, and a truingdevice for said tool comprising an arm having a truing element thereonmovable to and from a position in contact with the tool at a point inthe path of feeding motion of the center of the tool, said arm beingpivotally mounted at a point beyond the opposite side of the tool and inline with said point of contact and the center of the tool, whereby theperipheral contour of the tool is internally tangent to the circularpath described by the truing element in moving to and from operativeposition.

14. In a machine for internal grinding, a grinding tool rotatable on ahorizontal axis, means for imparting upward feeding movement to saidtool, and a truing device for said tool comprising an arm having atruing element thereon movable into and out of contact with said tool atits uppermost point, said arm being pivotally mounted at a pointdirectly below the center of said tool, whereby the path of movement ofsaid truing element is tangent to the peripheral contour of the tool.

15. In a turret grinding machine, a Work-holder carried by said turret,a tool rotatable on an axis aligned with said work-holder, a carriagefor said tool movable toward and from said workholder, a bed onA whichsaid carriage is slidably mounted, an arm pivotally mounted on said bed,a truing device carried by said arm and movable thereby into and out ofoperative position for truing said tool, means including a solenoid forrooking said arm to move the truing device into and out of operativeposition, and means for automatically controlling said solenoid, saidcontrol means including a switch and means actuated by movement of saidcarriage toward the Workholder to operate the switch for the Withdrawalof said truing device from operative position, said last named meansbeing actuable by movement of the carriage away from the Work to operatethe switch for the movement of the truing device into operativeposition.

16. In a turret grinding machine, a turret revoluble on a vertical axis,a plurality of Workholders radially arranged on said turret, a pluralityof tools rotatable on axes aligned respectively with certain of saidwork-holders, carriages for said tools movable to reciprocate said toolsalong their respective axes, and means for simultaneously reciprocatingsaid carriages, said last named means including a rockable membercoaxial with said turret, means for rocking said member, upright leverarms pivotally mounted at their lower ends and connected to respectivecarriages at their upper ends, and connecting rods extending betweensaid members and intermediate points of said lever arms.

17. A machine of the class described comprising a rotatable turret, aplurality of work-holders carried by said turret and movable therebyinto successive operating stations, tools at the severaloperatingstations arranged to be in operative relation to the work-holders insuccession, and means fcrautomatically rotating the workholders at theseveral stations at different predetermined speeds.

18. A machine of the class described comprising a rotatable turret, aplurality of tools, a plurality of rotatable work-holders carried bysaid turret and movable into operative relation with successive tools byindexing of said turret, means for feeding said tools in the generaldirection of the axis of rotation of said turret, and means forautomatically rotating said work-holders at different predeterminedspeeds, the speed of rotation of each Work-holder at any time beingdetermined by the operating station which it occupies at the time.

19. A machine of the class described comprising a rotatable turret, aplurality of tools arranged about said turret and each rotatable on anaxis transverse to the axis of rotation of the turret, a plurality ofWork-holders movable successively into operative relation with saidtools by indexing movement or" said turret, means for traversing eachsaid tool in the direction of its axis, and means for automaticallyrotating the Work-holders at different speeds predetermined foroperation with the several individual tools.

20. A machine of the class described comprising a rotatable turret, aplurality of tools arranged about said turret and each rotatable on anaxis transverse to the axis of rotation of the turret, a plurality ofwork-holders movable successively into operative relation withsuccessive tools by indexing movement of said turret, means fortraversing each said tool in the direction of its axis, and power meansfor automatically and independently feeding each said tool in thegeneral direction of the axis of rotation of the turret.

21. In a turret grinding machine, a work holder carried in said turret,a tool rotatable on an axis aligned with said Work-holder, a carriagefor said tool movable toward and from said workholder, a bed on whichsaid carriage is slidably mounted, a truing device rockably mounted onsaid bed, a solenoid actuable to rock said device into and out ofoperative position, and control means responsive to certain movements ofsaid carriage for controlling the energization of the solenoid.

22. In a grinding machine, a work-holder, a tool rotatable on an axisalined with said workholder, a carriage for said tool movable toward andfrom said work-holder, a bed on which said carriage is slidably mounted,an arm pivotally mounted on said bed, a truing device carried by saidarm and movable thereby into and out of operative position for truingsaid tool, a solenoid actuable to move said arm into and out ofoperative position, and control means responsive to movement of saidtool away from the Work to energize said solenoid to move the truingdevice into operative position, said control means being responsive tomovement of the tool toward the Work to deenerergize said solenoid.

23. A machine of the class described, comprising a plurality of tools, aplurality of rotatable Work-holders movable in turn into operativerelation with successive tools, and means for automatically rotatingeach work-holder at different speeds according to the particular toolwith which it is in operative relation.

` 24. A machine of the class described, comprising a plurality ofWork-holders movable in turn into operative relation with successivetools, means for simultanenously moving all said workholders from theiroperating stations to the next succeeding stations, means forautomatically rotating each work-holder at different speeds according tothe successive operating stations occupied thereby.

MERTON H. ARMS.

